介绍了一种测量谐振系统对地电容的新方法,首先向谐振系统中性点注入一定宽度、一定幅值的方波脉冲信号,再测量系统某一电气量（如中性点电压）的振荡频率,求得系统对地电容.本文通过理论分析得出了对地电容的算法,并对方波宽度和幅值做了约束.最后通过计算机仿真分析了阻尼电阻和中性点偏移电压对测量振荡频率的影响,提出了消除影响的措施.%A new method of measuring the ground capacitor of resonant system is introduced. by injecting a certain width and amplitude square wave pulse signal into neutral point, then measuring the amount of an electrical system （such as the neutral point voltage） of the oscillation frequency, and finally using a certain algorithms, system-to-ground capacitance is obtained. In this paper, the theory of this method is analyzed; thus capacitance of the algorithm is obtained, and the width and amplitude of each wave are restricted. Finally, through computer simulation, the impact of the damping resistors and neutral point voltage offset on the oscillation frequency measurements is discussed, and the method of eliminating the impact of proposed measures is put forward and the simulation results prove the theory analyzed.
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